2003AJ....125.1519F


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST05:01:26

2003AJ....125.1519F - Astron. J., 125, 1519-1529 (2003/March-0)

Collisional dynamics of stellar systems in the Northern and Southern Coalsack regions.

FRESNEAU A., VAUGHAN A.E. and ARGYLE R.W.

Abstract (from CDS):

The visual interstellar extinction in the Northern and Southern Coalsack regions is estimated from a photographic survey of proper motion and B,V photometry of 6x104 stars as faint as apparent magnitude 14 over a field of view of 6°x6° in each region. Each cloud is located at a distance of about 160±50 pc from the Sun and exceeds the mean interstellar extinction by more than 0.7±0.1 mag. Galactic plane orbits of 103 stars located at the same distance of 160±50 pc from the Sun in these regions show a semimajor axis of 8.45±0.15 kpc and a mean inclination of 0°.3±0°.2 over the Galactic plane, suggesting a mean impact parameter of 9±3 pc with diffuse clouds of relative velocity on the order of 4±1 km/s. The weak distant encounter of stars with the cold neutral medium can be explained by a mean mass of about 2500±1250 Mfor the gas and dust content in order to account for the diffusion of stellar orbits. A mean displacement of 0".012±0".001 yr–1 of the western limb of the Southern Coalsack is estimated in the northwest direction and permits a search for strong close stellar encounters. The transfer of angular momentum between the interstellar medium and the scattering of stellar orbits resulting from the encounters suggests a dissipation rate of (2.0±0.7)x10–4 Myr–1, leading to an equipartition time of 12±4 Myr. A spin rate of 0.25±0.05 km/s/pc of the diffuse clouds in the Southern Coalsack is measured and interpreted as the result of the perturbation induced by stellar systems during flyby encounters with a crossing time of 3 Myr, suggesting a cloud core radius of 1 pc.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - Stars: Kinematics - Surveys

Status at CDS:  

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 931 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5615 1
3 NAME Car Arm PoG 10 00 -60.0           ~ 377 1
4 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 883 2
5 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2191 0
6 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 349 1
7 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 242 0
8 NGC 4755 OpC 12 53 39 -60 21.7           ~ 268 0
9 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1110 1
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3006 0
11 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 281 1
12 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1792 1
13 LDN 810 DNe 19 45 23.8630 +27 50 57.840           ~ 62 0
14 NAME Northern Coalsack DNe 20 21 +37.0           ~ 100 0
15 LDN 977 DNe 21 39.0 +43 14           ~ 37 0
16 NAME Vela Sheet Cld ~ ~           ~ 14 0
17 NAME Great Dark Rift reg ~ ~           ~ 4 1

    Equat.    Gal    SGal    Ecl

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2020.06.02-05:01:26

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